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in a busy harbor, full of ships, the most important boat is a tugboat. What exactly does a tug boat do? Noah and Tanika find out when they spend an exciting day on the tugboat Hercules. Join them and see the sea gulls, porpoises, seals, barnacles, and jellyfish that live in the harbor waters. Watch the work on big ocean-going tugs, dredgers, and... more » drydocks. Discover why Hercules towns an oil boom around a sunken ship. At the end of the day, the tugboat captain has a surprise for Noah, Tanika - and you!« less